import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'
import Cate from '../components/goods/Cate.vue'
import Params from '../components/goods/Params.vue'
import GoodsList from '../components/goods/List.vue'
import Add from '../components/goods/Add.vue'
import Order from '../components/order/Order.vue'
import Report from '../components/report/Report.vue'
Vue.use(VueRouter)

const routes = [{
    path: '/',
    redirect: '/login'
  },

  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [{
        path: '/welcome',
        component: Welcome
      },
      {
        path: '/users',
        component: Users
      },
      {
        path: '/rights',
        component: Rights
      },
      {
        path: '/roles',
        component: Roles
      },
      {
        path: '/categories',
        component: Cate
      },
      {
        path: '/params',
        component: Params
      },
      {
        path: '/goods',
        component: GoodsList
      },
      {
        path: '/goods/add',
        component: Add
      },
      {
        path: '/orders',
        component: Order
      },
      {
        path: '/reports',
        component: Report
      }
    ]
  }
]



const router = new VueRouter({
  routes
})
router.beforeEach((to, from, next) => {
  // to 表示将要进入的页面
  // from 表示将要离开的那个页面
  // next 是一个函数  表示放行  
  // next('/login) 这里表示强制跳转 
  // 1 如果当问的是登录页  直接放行
  if (to.path === '/login') return next()
  // 2 如果访问的是有权限的页面需要判断有无token,有则直接放行，没有则强制返回到登录页面
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})
export default router
